I have performed isothermal DSC measurement and heating measurements with a rate of 50 K/min for a 100 gm steel ( temperature range is from 200-600 DegC. The steel is in as-quenched condition and the measurements are suppose to simulate steel tempering. I can not see any peaks for both cases. However, from the dilatometer experiments, i know that there are reactions during the tempering.
I am using pt crucibles with Al2O3 liner. The base lines are quite stable.
what i can think of is may be the heating rate is too fast or the energies of the reaction are too small to be detected.
I would be very happy to hear some suggestions or your view about this particular problem.
Thankyou
You will observe DSC signal only if there is a first order transition (melting or crystal-crystal transformation) or a glass transition. In the given temperature range your system does not exhibit such transitions.
since you use the isothermal condition, the reaction occurs at the very beginning when you reach the reaction temperature at a high heating rate. Please use a non-isothermal condition with relatively low heating rate. e.g. 5 K/min.
You can see phase diagram iron-carbon (callister, 1991) that only ferrite phase presents below 600 degC. To get the transition of steel you can use temperature above 600 deg.C.
Click on this link http://www.masontechnology.ie/x/Usercom_11.pdf
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